涡轮增压器离心压气机的试验技术.pptx
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涡轮增压器离心压气机的试验技术.pptx
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,CentrifugalCompressorExperimentalDevelopment,ConceptsETIInc,ConceptsNREC,Planning-1,Planning-2,ConceptsETIInc,Highestspeedlineinducerchokeindicatedbychangeinspacinganddramaticdropinoverallefficiency.Overallmeasurementsarewellsuitedforcycleorapplicationmatching.However,notsuitableforfundamentalinsightintocomponentperformanceand/ormodelbuilding.Fordetailedunderstandingofinternalflowsmustplanonaddingdetailedinstrumentationandestablishingarigoroustestprotocole.,OverallPerformance-Map,ConceptsETIInc,Speed:
RPMMassFlow:
mInlet:
T00&p00ExitCollector:
T08&p8orDiffuserExit:
p5,Ifoverallratingsarerequiredaccuracyofafewpercentforallparametersmaybeadequate.Betterthan1.52%onflowmeterrequirescalibration.Highaccuracyrequires:
Precision,calibratedinstrumentationGoodlaboratoryhookupGoodlaboratoryproceduresGoodcheckoutanddataprocessingprocedures.GoodRepeatability:
AccuraterigdimensionalcontrolPreciseoriginalconstructionGoodtestproceduresincludingconsistentinstrumentationGoodpartsandinstrumentationmaintenance(calibrations)Testdatamustberepeatableifnotfindreason.Smallchangesininletconfiguration,screenorductcanresultindramaticchangesinperformance.Toproblemsolveorbuildmodelsmusthavegoodaccurateandrepeatabletestdata.Largestvariationsatsurgelinethisisexpected.,DataRepeatability,Smallrig70mmdiameterwheelwithvanelessdiffuserRepeatBuilds,ConceptsETIInc,Note,totalpressurerakeusedtogivegeneralsenseofflowfield.PerhapsusefulforestablishingBCforCFDorforcomparisonofoverallaveragedperformancefromCFD.However,fordetailedcomparisontoCFDorforModelbuildingwillneedtoconsiderdetailedflowtraverse-either3holecobraprobeor5holeprobeifstrongdistortionsareexpectedinflow.,TurbineExhaustDiffuser-TotalPressureRake,ConceptsETIInc,Allotherinletswillproducesomelevelofvelocitygradients,possiblyswirlandotherflowdistortions.Inletsurveyswillberequiredorpenaltiesassociatedwiththeseissueswillresult.AfewKielprobeslocatedupstreamwillnotbesufficienttoexcept,perhaps,andnotonatotallyreliablebasis,detecttheseinletasymmetries,andalsotoprovideapproachstagnationstate.CobraProbe3holes(Total&staticpressureplusyawangle)5holeprobeTotal&staticpressureplusyaw&pitchangle.Totalpressuregradientsnearwall.4045degreesofpitchangle.-49degreesofyawangle.GoodprobecalibrationCRITICALandmaybemoreexpensivethantheprobeitself.Lasermeasurementsareanothermeansofdeterminingflowprofiles.,InletTraverseUsing5holeProbe,ConceptsETIInc,IGVat45setting.10radialpositionsatvariousangularpositionsover45degreepieslice.,PlottingStaticPressureonlywillmaskdiffusioneffectonshroud.PlotbladetiprelativeMachnumbers(IsentropicMachNo.)Removescentrifugalpressureriseeffecttorevealpassagediffusion/loadingcharacteristic.SpikeinMrel1atinletindicatesexcessivebladeand/oraerodynamicblockage.OnceMrel1isincreasedatinletitisimpossibletocompletelyrecoverinimpellerpassage.ResultishighMrel2andlowimpellerdiffusion(lowMR2)andlowimpellerperformance(lowrotor).IncreaseMrelatexitmayindicatesecondaryflowblockageeffects-insufficientimpellerexitdepth,b2.Scaling4.5PR23bladeprogenitorwith0.011”bladeLEthicknesstoapproximatelyscale20bladecastALimpellerwith0.0150.018”LEthickness.ResultinMrel1greaterthan1toomuchbladeblockagefixcutback10bladestoproducesplitters.Ideallywouldlikecontinuousshrouddiffusionwellplacedsplitterscanstillproduceasmoothdiffusion(loading)alongshroud.,RotorCoverExamination,Steady,ConceptsETIInc,BladetoBladegradientisindicationofloading.Bladesnearlyunloadedatdiffuserinlethowevergradientspropagatewellintodiffuser.Thesegradientsaresupportedbycurvatureeffectsintheflowfield.Nextgenerationvanelessdiffusermodelswillaccountfortimecyclicvariationsintheimpellerwakestointegratesecondaryflowmassfractionandexitdeviationintovanelessdiffuserlossmodelsforhigheraccuracymodeling.,RotorCoverExamination,Dynamic,ConceptsETIInc,Closedloop1.8PR,variableRE,adiabaticStage-and-halftestrigwithdrygasseals.Unseparatedinletbend,variousdiffuserblocksInletswirlgeneratorandupstreamreturnchannel.Comprehensivewallstaticspressuremeasurements,totalpressuremeasurementsandimpellerexitCobraprobetraverse.,RotorExitEvaluation1,ConceptsETIInc,Wheredoesthediskfrictionworkendup?
Isitconvectedoutofthemachineorlumpedintorecirculationlosses.-the%orsouncertaintyinthisisinvariablywashedoutinthenoiseuncertainty.Withoutimpellerexittraversemustdooneoffollowingtocloseonequation.assumedeviationandbackoutrecirculationworkAssumerecirculationandbackoutexitdeviatio
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- 关 键 词:
- 涡轮 增压 离心 压气 试验 技术